Finding the Fourth Proportional to 1,959.98, 2,938.78 and 920.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,959.98 : 2,938.78 = 920.21 : x
2. Step 2: Convert to fraction form
   1,959.98/2,938.78 = 920.21/x
3. Step 3: Cross multiply
   1,959.98x = 2,938.78 × 920.21
4. Step 4: Simplify right side
   1,959.98x = 2,704,280.05
5. Step 5: Solve for x
   x = 2,704,280.05/1,959.98
6. Step 6: Final answer
   x = 1,379.75